HomeMy WebLinkAboutMonterra Townhomes Stormwater CovenantEXHIBIT “A”
SITE PLAN
FOR
MONTERRA
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If the limited infiltration flow control BMP is proposed for a project, the following
maintenance and operation instructions must be recorded as an attachment to the
required declaration of covenant and grant of easement per Requirement 3 of Section
C.1.3 .3 (p. C-18). The intent of these instructions is to explain to future property
owners, the purpose of the BMP and how it must be maintained and operated. These
instructions are intended to be a minimum; ODES may require additional instructions
based on site-specific conditions. Also, as the County gains more experience with the
maintenance and operation of these BMPs, future updates to the instructions will be
posted on King County's Surface Water Design Manual website.
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Your property contains a stormwater management flow control BMP (best management
practice) called "limited infiltration," which was installed to mitigate the stormwater
quantity and quality impacts of some or all of the impervious surfaces on your property.
Limited infiltration is a method of soaking runoff from impervious area (such as paved
areas and roofs) into the ground. Infiltration devices, such as gravel filled trenches,
drywells, and ground surface depressions, facilitate this process by putting runoff in
direct contact with the soil and holding the runoff long enough to soak most of it into the
ground. To be successful, the soil condition around the infiltration device must be able
to soak water into the ground for a reasonable number of years.
The infiltration devices used on your property include the following as indicated on the
flow control BMP site plan: gravel filled trenches, drywells. The size, placement,
and composition of these devices as depicted by the flow control BMP site plan and
design details must be maintained and may not be changed without written approval
either from the King County Water and Land Resources Division or through a future
development permit from King County.
Infiltration devices must be inspected annually and after major storm events to identify
and repair any physical defects. Maintenance and operation of the system should focus
on ensuring the system's viability by preventing sediment-laden flows from entering the
device. Excessive sedimentation will result in a plugged or non-functioning facility. If
the infiltration device has a catch basin, sediment accumulation must be removed on a
yearly basis or more frequently if necessary. Prolonged pending around or atop a device
may indicate a plugged facility. If the device becomes plugged, it must be replaced.
Keeping the areas that drain to infiltration devices well swept and clean will enhance the
longevity of these devices. For roofs, frequent cleaning of gutters will reduce sediment
loads to these devices.
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Typical InfiltrationTrench Detail
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EXHIBIT “C”
LEGAL
DESCRIPTION
FOR
MONTERRA
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Exhibit C – Legal Description
PARCEL B OF CITY OF RENTON LOT LINE ADJUSTMENT LUA-06-126-LLA RECORDED UNDER AFN
20070320900004 IN BOOK 221 OF SURVEYS ON PAGE 18, RECORDS OF KING COUNTY, WASHINGTON.
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